Two people were injured and airlifted to the hospital after their cars collided Tuesday night in Richmond, police said.

Lt. Mike Gormley of the Richmond Police Department said a white Honda and a silver Porsche collided at 8:45 p.m. on Richmond Parkway near Castro Street. Both drivers were taken by helicopter to an area hospital.

Gormley said one victim was in critical condition and the other was listed in serious condition.

The California Highway Patrol shut down the parkway as Richmond police investigated the crash. Gormley said the cause of the crash is still under investigation.

Otto Warmbier was arrested in January 2016 at the end of a brief tourist visit to North Korea. He had been medically evacuated and was being treated at the University of Cincinnati Medical Center when he died at age 22.